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Interacting dimers on the honeycomb lattice: an exact solution of the five-vertex model

Author

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  • Huang, H.Y.
  • Wu, F.Y.
  • Kunz, H.
  • Kim, D.

Abstract

The problem of close-packed dimers on the honeycomb lattice was solved by Kasteleyn in 1963. Here we extend the solution to include interactions between neighboring dimers in two spatial lattice directions. The solution is obtained by using the method of Bethe ansatz and by converting the dimer problem into a five-vertex problem. The complete phase diagram is obtained and it is found that a new frozen phase, in which the attracting dimers prevail, arises when the interaction is attractive. For repulsive dimer interactions a new first-order line separating two frozen phases occurs. The transitions are continuous and the critical behavior in the disorder regime is found to be the same as in the case of noninteracting dimers characterized by a specific heat exponent α = 12.

Suggested Citation

  • Huang, H.Y. & Wu, F.Y. & Kunz, H. & Kim, D., 1996. "Interacting dimers on the honeycomb lattice: an exact solution of the five-vertex model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 228(1), pages 1-32.
    • Handle: RePEc:eee:phsmap:v:228:y:1996:i:1:p:1-32
    DOI: 10.1016/S0378-4371(96)00057-X
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